Improved sukface-gauge



` PETER-S, PMoTo-UTHOGRAPNER. WASHINGTON D C WILLIAM F. CORNELL, OFADRIAN, `MICHIGAN.

Laim .Pat-em No, 81,144, dated August 18, 1868.

turnover SURFACE-GAUGE.

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'ro ALL wHoMu'r MAY CQNGERN:

Be it known that I, WILLIAM F. CORNELL, ofthe eityof Adrian, in thecounty of Lenawee, and State of Michigan, have invented a new and usefulImprovement in Surface-Gauges; and-I do hereby declare the following'tobe a full, clear, and exact description ofthe same, which will enableothers skilled in the art to make and use'my invention, reference beinghad to the accompanying drawings, and to the letters of reference markedthereon, making a part of -this specification, like letters referring tolike parts.

Myyinventiou consists in a surface-gauge for machinists; so constructedthat hy the luse of one adjustable screw the surface and scribing-pointare held in any position -or elevation desired.k

To enable others skilled in the art to make and use my invention, I willproceed todescribe its construction and operation.

In the drawngs- Figure 1 represents aperspective view of a surface-gaugeembodying my invention.;- Figur-e 2 represents a sectional view of myimproved gauge, passing through the centre of the spindle B, andparallel with the pointer C. i v

Figure 3 represents a horizontal section, passing through the centre ofthe adjustable screw D, andcentre of the pointer C placed in ahorizontal'posi'tion.

Figure 4represents a T-headed arbor, at right angles with the centre ofthe pointer-G.

,Figure 5-represents a transverse section of this arbor,'together with aconical-shaped washer, b.

A represents the base.

B represents the spindle.

E represents a cylindrical clasp.

D represents the adjustable screw.

C represents the pointer.

o represents a 'semispherical staple.

-1 l represent countersunk seats.

H represents a T-headed arbor..

N represents a T-'ended collar.

represents Aa conical-shaped washer.

z' i represent conical shoulders. I

This' washer b is placed between the cylindrical clasp E and theadjustable screw D, and has a feather, c, topreventit from turning uponthe arbor H, but allowing, at the sometime, a movement to andvfro uponthe arbor.

In fig. 4, the T-ended collar is represented as' shoved back onthe-arbor H, away from the pointer C., Having thus described theconstruction of my improved surface-gauge, I will now describeitsoperation' and use.

I first unscrew the adjustable screw D. This unlooses all the adjustableparts, and allows the cylindrical clasp E to move freely up or down thespindle, and allsofthe' pointer C to move lengthwise between the concaveclamps formed bythe head ofthe T-hended arbor and the end ofthe T-endedcollar, and allows, also, a revolv- 'ing movement of the pointer Caround its own centre,'and also around the centre of the T-headed arborH, and thus bringing the pointer C in any position desired.

I next (in order to hold the pointer C in this positionyclaspl theAspindle B with one hand, and with the other tighten up the `adjustablescrew D, which presses against the conical-shaped washer b, and this,in-turn, against a corresponding seat in the end of one of the bosses ofthe cylindrical clamp E, and, simultaneously, the arbor Hdraws itsconcave head against the pointer C, and this also, Ain turn, againstthe'concave of the T-endedl collar N, which presses its conical shoulderagainst a corresponding seat inthe other boss of the clasp E.

Olazms. what I claim as new, and desire to secure by Letters Patent, is

lindrical head, and semispherical stapleo, in combination with purposeof forming a. clasp, all con- Having thus described my invention,

1. TheT-headed arbor H,vha.ving a. semi-cy the T-ended collar N, withits concave and semi-cylindrical end, for the structed in the manner andfor the purpose set forth and described.

2. The conical-shaped washer b, and feather e, in combination wit H,constructed in the'manner set forth and described.

` WM. F. CORNELL.

Witnesses:

JOHN P. CHURCH, G. F. PARTMDGE.

h the clasp E, nut D, and r-headed arbor

